I felt my heart sinking into my boots. Two minutes, twenty-three seconds seemed very fast. And I knew that if I couldn’t beat that time, then I would have to do it again. And Patrick’s whole demeanour oozed confidence. He didn’t believe for one moment that I would be faster than him. And, to be honest, neither did I. But there was no point in dwelling on it, to be defeated by my own fear.

I climbed up on to the parapet, and holding on to the top spikes, slid my feet down the other side of it until they reached the ledge. The iron of the spikes was icy cold, biting into already frozen hands. But I held on to them, testing the frosted snow beneath my feet. To my surprise, my rubber soles provided an amazing amount of grip. And I finally let go to find myself balanced on the curve of the ledge, with almost four hundred feet of it stretching ahead of me. If I crossed it using the same technique as Patrick, then whether or not I bettered his time was in the lap of the gods. But if I used my outstretched arms for balance and walked straight, as along a line of kerbstones, I was sure I could do it faster. As long as I didn’t slip. Only when I reached the arch supports would I have to resort to Patrick’s method of getting around them.

I drew a deep breath, resisting the temptation to look down, and called out, “All right, start the watch.” And I set off with my eyes firmly fixed on Kirkbrae House at the other end. I could feel the frozen snow creaking beneath my feet, my left arm raised higher than my right to avoid touching the parapet. The slightest miscalculation, even the smallest nudge of the parapet wall, would likely send me spinning off into space.

I reached the first arch support and flung my arms around it, sliding my feet sideways along the ledge, as I had seen Patrick do. Then steadied myself at the far side of it for the next length. I was filled with a strange sense of elation, feeling as if I could almost break into a run. Of course, that would have been impossible, but confidence surged through me now and I increased my speed, one careful foot in front of the other. From the far side of the parapet I could hear Tam’s voice. “Jesus, Paddy, he’s fast!”

And Peter. “Go, Johnny, go!”

By the time I reached Kirkbrae House, and pulled myself over the parapet to safety, I knew I’d done it faster. Patrick knew it too, and I could already see his apprehension growing as we waited for Catherine and Danny to run across the bridge to join us.

Danny’s face was a mask of trepidation. Catherine’s split by a triumphant smile.